Madam C.J. Walker (December 23, 1867 – May 25, 1919) was an American businesswoman, hair care entrepreneur, tycoon and philanthropist.

Her fortune was made by developing and marketing a hugely successful line of beauty and hair products for black women. The Guinness Book of Records cites Walker as the first female, black or white, self-accomplished millionaire.

She was born Sarah Breedlove in Delta, Louisiana, the first member of her family born free. Her parents were slaves. She had five siblings; one sister and four brothers. She was raised on farms there and in Mississippi. She picked cotton on a plantation as a child, and became an orphan at the age seven.

At age 14, she married a man named Moses McWilliams, and was widowed at age 20. She then moved to St. Louis to join her brothers. Sarah worked as a laundress for as little as a dollar and a half a day, but she was able to save enough to educate her daughter. While living in St. Louis, she joined the St. Paul's African Methodist Episcopal Church, which helped develop her speaking, interpersonal and organizational skills.

She became interested in a hair tonic while trying to treat a scalp ailment caused by working with chemicals as a laundress that left her temporarily bald. In 1905, Sarah moved to Denver, Colorado, working as a hair tonic sales agent for Annie Malone, another black woman entrepreneur.

She married her third husband, Charles Joseph Walker, a St. Louis newspaperman, changed her name to "Madam C.J. Walker," and founded the Madam C.J. Walker Manufacturing Company to sell hair care products and cosmetics.

In 1910, Madam Walker moved her growing manufacturing operations to a new industrial complex in Indianapolis, and by 1917, it was the largest business in the United States owned by a black person.

Walker saw her personal wealth as not an end in itself, but a means to help promote and expand economic opportunities for others, especially black people. She took great pride in the profitable employment—and alternative to domestic labor—that her company afforded many thousands of black women who worked as commissioned agents for Walker's company. Her agents could earn from $5 to $15 a day, in an era when unskilled white laborers were making about $11 a week. One of her employees, Marjorie Joyner, started under her influence and went on to lead the next generation of African American beauty entrepreneurs. Walker was also known for her philanthropy, leaving two-thirds of her estate to educational institutions and charities including the NAACP, the Tuskegee Institute and Bethune-Cookman College. In 1919, her $5,000 pledge to the NAACP's anti-lynching campaign was the largest gift the organization had ever received. She died at her estate, Villa Lewaro, soon after on May 25, 1919 due to kidney failure and other complications resulting from hypertension. She was buried at Woodlawn Cemetery in the Bronx at 51 years of age.

Walker's daughter, A'Lelia Walker, carried on this tradition, opening her mother's home and her own to writers and artists of the emergent Harlem Renaissance and promoting important members of that movement. She converted a section of her Harlem townhouse at 108-110 West 136th Street into The Dark Tower, a salon and tearoom, where Harlem and Greenwich Village artists, writers and musicians gathered. Poet Langston Hughes called her "The joy goddess of Harlem's 1920s" in his autobiography, The Big Sea, because of the lavish parties she hosted in Harlem and Irvington.

Walker had a mansion called "Villa Lewaro" built in the wealthy New York suburb of Irvington on Hudson, New York, near the estates of John D. Rockefeller and Jay Gould, and spent hundreds of thousands of dollars on furnishings. The Italianate villa was designed by architect Vertner Tandy, the first registered black architect in the state of New York, in 1915. She also owned townhouses in Indianapolis and New York. Her New York townhouse was built in 1915 and demolished by the city in 1941.